With current form designer , there is no any way that you can . have 3 or 4 checkboxes per row ( horizontally) in a form . You can use the "Orientation' attribute of a radio group , but there is no concept of checkbox group .
Tried to use "column layout" to achieve it. However , although you can put as many checkboxes as you want into column layout , you can only have maximum two checkboxes per line ( see attached screenshot) .
It would be preferable to be able to line up 3 or 4 checkboxes horizontally across the form (as is available using radio groups) rather than being limited to only maximum two checkboxes ( by using column layout ) per row on the form.